Patent US3690858A successfully refreshed from Google Patents.
US3690858A
Expired / Lapsed
US
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Combating weeds and algae with 2-chloro-5-aryl-1,3,4-thiadiazoles
Assignee: Gulf Research and Development Co
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Filing: 1969-10-24
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Granted: 1972-09-12
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Expires: 1989-10-24
Abstract
Abstract 5-ARYL-TETRAZOLES MAY BE REACHED WITH THIOPHOSGENE TO YIELD 2-CHLORO-5-ARYL-1,3,4-THIADIAZOLES WHICH HAVE UNUSUALLY SELECTIVE PHYTOTOXIC PROPERTIES, BEING PARTICULARLY USEFUL IN COMBATING CRABGRASS AND ALGAE.
Inventors
- 👤 Norman A Dahle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:28
CPC Classifications
C; C07; C07D; C07D285/00; C07D285/01; C07D285/02; C07D285/04; C07D285/12; C02; C02F; C02F1/00; C02F1/50
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |